The Role of Soil pH in Plant Nutrition and Soil Remediation

In the natural environment, soil pH has an enormous influence on soil biogeochemical processes. Soil pH is, therefore, described as the “master soil variable” that influences myriads of soil biological, chemical, and physical properties and processes that affect plant growth and biomass yield. This paper discusses how soil pH affects processes that are interlinked with the biological, geological, and chemical aspects of the soil environment as well as how these processes, through anthropogenic interventions, induce changes in soil pH. Unlike traditional discussions on the various causes of soil pH, particularly soil acidification, this paper focuses on relationships and effects as far as soil biogeochemistry is concerned. Firstly, the effects of soil pH on substance availability, mobility, and soil biological processes are discussed followed by the biogenic regulation of soil pH. It is concluded that soil pH can broadly be applied in two broad areas, i.e., nutrient cycling and plant nutrition and soil remediation (bioremediation and physicochemical remediation).

[1]  N. Uren,et al.  Types, amounts, and possible functions of compounds released into the rhizosphere by soil-grown plants , 2007 .

[2]  S. Allison,et al.  Stoichiometry of soil enzyme activity at global scale. , 2008, Ecology letters.

[3]  E. Topp,et al.  Dependence of accelerated degradation of atrazine on soil pH in French and Canadian soils , 2000 .

[4]  Z. Rengel.  GENOTYPIC DIFFERENCES IN MICRONUTRIENT USE EFFICIENCY IN CROPS , 2001 .

[5]  Herbert E. Allen,et al.  Metal Speciation and Contamination of Soil , 1994 .

[6]  Z. Cai,et al.  Soil pH was the main controlling factor of the denitrification rates and N2/N2O emission ratios in forest and grassland soils along the Northeast China Transect (NECT) , 2012 .

[7]  Benjamin L Turner.  Variation in pH Optima of Hydrolytic Enzyme Activities in Tropical Rain Forest Soils , 2010, Applied and Environmental Microbiology.

[8]  B. Minasny,et al.  Soil pH increase under paddy in South Korea between 2000 and 2012 , 2016 .

[9]  Y. Avnimelech,et al.  Ammonia Volatilization From Soils: Equilibrium Considerations 1 , 1977 .

[10]  T. Ohno,et al.  Effect of wood ash application on soil pH and soil test nutrient levels , 1990 .

[11]  D. Curtin,et al.  Base cations, K+ and Ca2+, have contrasting effects on soil carbon, nitrogen and denitrification dynamics as pH rises , 2017 .

[12]  S. A. Barber,et al.  Bicarbonate Accumulation and pH Changes at the Soybean (Glycine max (L.) Merr.) Root-Soil Interface 1 , 1969 .

[13]  Peter J. Gregory.  A history of rhizosphere research - roots to a solution. , 2010 .

[14]  J. Baldock,et al.  Contribution of soluble and insoluble fractions of agricultural residues to short‐term pH changes , 2011 .

[15]  P. Nye.  PROCESSES IN THE ROOT ENVIRONMENT1 , 1968 .

[16]  Allan Walker,et al.  Microbial degradation of organophosphorus compounds. , 2006, FEMS microbiology reviews.

[17]  I. Thornton,et al.  Factors influencing metal bioavailability in soils: preliminary investigations for the development of a critical loads approach for metals , 1998 .

[18]  D. Curtin,et al.  pH-dependence of organic matter solubility: Base type effects on dissolved organic C, N, P, and S in soils with contrasting mineralogy , 2016 .

[19]  G. Gobran,et al.  Temporal variations of rhizosphere and bulk soil chemistry in a Douglas fir stand , 2007 .

[20]  E. Covelo,et al.  Effect of amendments made of waste materials in the physical and chemical recovery of mine soil , 2014 .

[21]  J. Deckers,et al.  The soil Atlas of Africa , 2011 .

[22]  P. Brookes,et al.  Nitrogen mineralisation along a pH gradient of a silty loam UK soil , 2008 .

[23]  Guodong Fang,et al.  Leachability, availability and bioaccessibility of Cu and Cd in a contaminated soil treated with apatite, lime and charcoal: A five-year field experiment. , 2016, Ecotoxicology and environmental safety.

[24]  R. Conrad,et al.  Influence of soil pH on the nitrate-reducing microbial populations and their potential to reduce nitrate to NO and N2O , 1990 .

[25]  Dorota Kulikowska,et al.  The effect of landfill age on municipal leachate composition. , 2008, Bioresource technology.

[26]  J. Baldock,et al.  Model organic compounds differ in their effects on pH changes of two soils differing in initial pH , 2010, Biology and Fertility of Soils.

[27]  U. Schmidhalter,et al.  Carbon and nitrogen mineralization in different upland soils of the subtropics treated with organic materials , 2005 .

[28]  M. Faget,et al.  Disentangling who is who during rhizosphere acidification in root interactions: combining fluorescence with optode techniques , 2013, Front. Plant Sci..

[29]  Benoît Jaillard,et al.  Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review , 2004, Plant and Soil.

[30]  B. Singh,et al.  Role of Soil pH in the Development of Enhanced Biodegradation of Fenamiphos , 2003, Applied and Environmental Microbiology.

[31]  C. A. Campbell,et al.  EFFECTS OF ACIDITY ON MINERALIZATION: pH- DEPENDENCE OF ORGANIC MATTER MINERALIZATION IN WEAKLY ACIDIC SOILS , 1998 .

[32]  A. Kabata-Pendias.  Trace elements in soils and plants , 1984 .

[33]  G. Cornelissen,et al.  Effect of Soil pH Increase by Biochar on NO, N2O and N2 Production during Denitrification in Acid Soils , 2015, PloS one.

[34]  R. Isla,et al.  Soil pH effects on nitrification of fall-applied anhydrous ammonia , 2004 .

[35]  H. Bradl.  Adsorption of heavy metal ions on soils and soils constituents. , 2004, Journal of colloid and interface science.

[36]  J. Baldock.  Composition and Cycling of Organic Carbon in Soil , 2007 .

[37]  M. L. Thompson,et al.  Characterization and quantification of biochar alkalinity. , 2017, Chemosphere.

[38]  C. Tang,et al.  Impact of chemical composition of legume residues and initial soil pH on pH change of a soil after residue incorporation , 1999, Plant and Soil.

[39]  Xiaohan Yang,et al.  The role of root exudates and allelochemicals in the rhizosphere , 2003, Plant and Soil.

[40]  M. Muneer,et al.  Photocatalytic degradation of wastewater pollutants. Titanium-dioxide-mediated oxidation of polynuclear aromatic hydrocarbons , 1994 .

[41]  E. Blagodatskaya,et al.  Interactive effects of pH and substrate quality on the fungal-to-bacterial ratio and QCO2 of microbial communities in forest soils , 1998 .

[42]  Ting-Ting Zhang,et al.  Environmental factors and dissolved organic carbon content in a Jinchuan peatland , 2016 .

[43]  Laura E. Green,et al.  Pulse dynamics and microbial processes in aridland ecosystems , 2008 .

[44]  Robert E. White,et al.  Principles and practice of soil science : the soil as a natural resource , 1997 .

[45]  Benjamin L Turner,et al.  Changes in enzyme activities and soil microbial community composition along carbon and nutrient gradients at the Franz Josef chronosequence, New Zealand , 2007 .

[46]  Jianming Xu,et al.  The role of plant residues in pH change of acid soils differing in initial pH , 2006 .

[47]  Jinlan Xu.  Bioremediation of Crude Oil Contaminated Soil by Petroleum-Degrading Active Bacteria , 2012 .

[48]  Duan Zheng-hu,et al.  Effects of soil properties on ammonia volatilization , 2000 .

[49]  R. Dahlgren.  Biogeochemical processes in soils and ecosystems: From landscape to molecular scale , 2006 .

[50]  R. B. Jackson,et al.  The diversity and biogeography of soil bacterial communities. , 2006, Proceedings of the National Academy of Sciences of the United States of America.

[51]  M. Šimek,et al.  The influence of soil pH on denitrification: progress towards the understanding of this interaction over the last 50 years , 2002 .

[52]  D. Neina,et al.  Short-term effects of human urine fertiliser and wood ash on soil pH and electrical conductivity , 2013 .

[53]  G. Gillman.  An analytical tool for understanding the properties and behaviour of variable charge soils , 2007 .

[54]  Effect of soil acidification on nitrification in soil , 2015 .

[55]  D. Hopkins,et al.  What is the so-called optimum pH for denitrification in soil? , 2002 .

[56]  P. Brookes,et al.  Relationships between soil pH and microbial properties in a UK arable soil , 2008 .

[57]  F. Vogel,et al.  The mean oxidation number of carbon (MOC)—a useful concept for describing oxidation processes , 2000 .

[58]  P. Hinsinger.  Bioavailability of soil inorganic P in the rhizosphere as affected by root-induced chemical changes: a review , 2001, Plant and Soil.

[59]  Lihua Huang,et al.  Assessment of Ammonia Volatilization Losses and Nitrogen Utilization during the Rice Growing Season in Alkaline Salt-Affected Soils , 2017 .

[60]  J. Baldock,et al.  The contribution of crop residues to changes in soil pH under field conditions , 2012, Plant and Soil.

[61]  A. Buerkert,et al.  Microbial response to the restoration of a Technosol amended with local organic materials , 2016 .

[62]  W. L. Nelson,et al.  Soil Fertility and Fertilizers , 1957 .

[63]  Joanna M. Clark,et al.  Acidity controls on dissolved organic carbon mobility in organic soils , 2012 .

[64]  P. Saetre,et al.  Leaching of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in mor humus as affected by temperature and pH , 2000 .

[65]  S. Andersson,et al.  Influence of pH and temperature on microbial activity, substrate availability of soil-solution bacteria and leaching of dissolved organic carbon in a mor humus , 2001 .

[66]  N. E. Nielsen,et al.  The effects of root-induced pH changes on the depletion of inorganic and organic phosphorus in the rhizosphere , 1992, Plant and Soil.

[67]  A. Buerkert,et al.  Effects of Land Use on Microbial Indices in Tantalite Mine Soils, Western Rwanda , 2017 .

[68]  T. Anderson.  Microbial eco-physiological indicators to asses soil quality , 2003 .

[69]  M. Verloo,et al.  Characteristics of wood ash and influence on soil properties and nutrient uptake: an overview. , 2001, Bioresource technology.

[70]  M. Vidali.  Bioremediation. An overview , 2001 .

[71]  P. Marschner,et al.  Soil Respiration, Microbial Biomass and Nutrient Availability in Soil After Addition of Residues with Adjusted N and P Concentrations , 2017 .